Easter eggs

An Easter egg is an undocumented, obscure, or otherwise "hidden" command — usually buried deep within a program's source-code and only triggered by executing a certain series of actions or system commands. Often, an Easter egg will reveal an inside joke, though Easter eggs can also be placed into in-game props and scenery or only in areas visible to those that are actively using "cheat codes" (or otherwise circumventing the "normal" operation of the software).

While Easter eggs were once included in virtually all computer software, software companies such as Microsoft have discontinued the practice, citing security concerns associated with undocumented (and often untested) code.

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Guards of cities will respond to some emotes such as /wave, /rude, /kiss,/chicken,/shy, or /salute. This does not apply to all guards though, most notably Darnassus Sentinels do not reply to emotes and even the same guard will not always respond. However, if you ask a Darnassus Sentinel about the enchanting trainer, she may respond as if you said she was enchanting. Also, if a blood elf paladin /eye a Silvermoon Guard, they will /kneel.

Players who are fed up with the rude female dwarf who presides over the quest chain to obtain the key to Searing Gorge, Mountaineer Pebblebitty in extreme southern Loch Modan, may feel inclined to use /rude on her after all the trouble she puts them through. Blizzard has anticipated this and provided an appropriate response.

The Panda Cub and Sleepy Willy lie down and sleep (you see green Z Z Z ...) when idle. The Panda Cub named Meng Meng will give you one Magic Bamboo Stick if you /love it. You can only get one in your bags at a time. It'll turn you into a panda cub for ten minutes!

If you type /dance on the civilian ghosts in Stratholme, they will respond in kind and dance with you. Even if you attack them, subsequently dancing with them will make them dance with you instead of continuing to attack you.

Also, appropriately, they will respond to the /rude emote with a rude action of their own.

An exceptionally well hidden Mickey Mouse is located in the Valley of Honor within the Horde city of Orgrimmar, where the Hunter trainers are. It is so large, and so well sculpted into the surroundings, that most people will never know that it is there. The only way to see it is to manually increase the maximum zoom setting of the camera.

Bambina (Bambi), Mother of Bambina (Bambi's Unnamed Mother), Flora (Flower), and Thudder (Thumper) will all be walking in close proximity to the Westfall Brigade Encampment where the ground is yellow (You will know what I mean when you get there). Also, there is a mob named "Westfall Brigade Hunter" who will occasionally spawn and shoot Mother of Bambina and do a /cheer, causing Bambina to become enraged, get renamed to "Vengeful Bambina", and start attacking the Hunter.

Go into Uldaman and find the 3 Dwarves. Olaf, Eric "The Swift", and Baelog are all lost inside Uldaman. Those 3 Dwarves are all from another game named The Lost Vikings. The staff and medallion are also references. The "Staff of Tsol" and the "Medallion of Gni'kiv" are used for another quest. "Tsol" and "Gni'kiv" are "Lost" and "Viking" backwards.

In Elwynn Forest "Crystal Lake" is a reference to "Friday the 13th". You can also find "Jason Mathers" at the dock next to the fishing trainer.

Jason Mathers at Crystal lake.

There is also a large smiley face underneath Karazhan. You can see it if you log out near Karazhan. Once you log back in, before the doodads and NPCs load up, you can see the smiley face. Humans can get under Karazhan to the smilie face by jumping to a certain ditch in the corner of the rubble in the back side of Karazhan (facing the crypt/graveyard). You can also find 2 skeletons in a bed in the Guest Quarters, specifically the door opposite of the entrance. One skeleton is holding a vial while the other has a knife in the lower rib cage, this is a reference to "Romeo and Juliet" in which Romeo drank poison and Juliet stabbed herself in the stomach. There is also a small bouquet or roses above their bodies.

In Searing Gorge, if you head just a little north of Blackchar Cave and zoom your mini-compass all the way out, you can see a smiley face in it.

When floating underwater, one of the motes that float by will very occasionally be a tiny smiley face.

There is a small island in the Bittertide Lake in Sholazar Basin with a door and a handle, on which there is a plaque that reads "5 9 16 17 24 43". It's a reference to the sequence of numbers "4 8 15 16 23 42" from the show Lost. There is also a Darkmoon Fortune Card with the sequence numbers from Lost.

In the Quest "Blindeye the Guardian", you kill an ettin of the same name. This could easily be referring to the band [| Blind Guardian]. Also, the building he is in looks similar to a guitar from the air.

At Windshear Hold in the Stonetalon Mountains there is an elite gnome mech called Big Papa, a little girl is seen walking around the massive machine occasionally saying "Wake up Mr. P" or "Wake up Mr. P! You've gotta save the spirts." This is a reference to the Big Daddy and Little Sister characters from 2k's game Bioshock.

Anderov Ryon

In the same area there is also a citizen form Gilneas who says a modified version of the speech given by Andrew Ryan, the main villian from the first Bioshock game

Bioshock Infinite

In Stormwind City there is an NPC leisurely strolling about called 'Elizabeth Birdsong'. This is a reference to the Bioshock Infinite character Elizabeth whose guardian throughout the game is the Songbird, hence the NPC's last name. Her quotes include: 'The possibilities are infinite.', this being a direct reference to the title of her game. She even sports a similar hairstyle and dress!

At the Imperial Granary in the Valley of the Four Winds which is plagued by Sprites,
under the archway to the main building there is a squash wearing a pilgrim hat. This may be a reference to the first American thanksgiving, in which the pilgrims had little to drink but Beer due to the poor quality of the water.

There is a rare mob in Hillsbrad Foothills named Gravis Slipknot. This is likely to be named after the band Slipknot; when you initiate combat with him he says "Greetings, hapless adventurer, I ask only that you wait a moment...and BLEED!". Slipknot have a song called "Wait and Bleed".